There isn't an out of the box solution to get SMS tracking of a specific journey.
However, there are other ways to get what you want:
Query SMSMessageTracking data view and tie the data back to your customers who received that specific SMS.
This data view allows customers to view their send and receive
history. Information from this query relates to the owner of a private
short code or long code or a client using a shared short code to which
the subscriber has opted in.
Another way to go would be the SMS Message Detail Report.
This report includes detailed tracking information about messages sent
from an account, including descriptive information about the message
and send status at an individual level.
These are the fields you'll get on your report's file. The only limitation is you can only create a Date based report and not Journey based.
Or, you can check the SMS Analytics under Journey Analytics. It gives you a global preview about all your Journey's SMS performance (delivered, undelivered,..).